Malicious PDF — malware analysis report

Static analysis result for SHA-256 856586fcd066c83d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-27 17:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87c96770e6eacab1744c5e83bfac5f45 SHA-1: 9848f030e6df0b3d01a89d9bb3666652b2a04e9d SHA-256: 856586fcd066c83d95ad8108ab5f58f27fd122bf60c89901b14e093a7ea9d09a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to Weebly and other file-hosting services, suggesting a link farm or a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of a phishing lure designed to lead users to download additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/award?keyword=clinical+virology+manual+pdf
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/xoxonurit.pdf
    • https://kabibejago.weebly.com/uploads/1/3/6/0/136050231/3039536.pdf
    • http://ver-alex.website/873157300232p6lr.pdf
    • https://cdn.sqhk.co/sisadenev/dijMegg/hot_springs_story_move_rooms.pdf
    • http://zokoxakabu.medianewsonline.com/7870324097.pdf
    • http://xuridikak.22web.org/gifuderuxelorusarupojok.pdf
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/6706125.pdf
    • http://sfr-webmail.com/twitter_video_without_app2j8ih.pdf
    • http://contentmedialiteracy.com/job_answered_bildad_the_shuhiteldxea.pdf
    • http://table-wait.com/why_wont_my_electric_shower_turn_onkveaa.pdf
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/wijafixuriba.pdf
    • https://cdn.sqhk.co/bamebuxi/ZZifljc/human_fall_flat_ice_level_switch.pdf
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/2784877.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nosijatigatu.epizy.com/20041748999.pdf
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_dde3a7881e1547a7ba4033b751d25e6c.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_4456b1c977b04fa0b531d5ff318f66e4.pdf?index=true
    • http://kinowazekuponaw.rf.gd/jasper_report_new_line.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_d4751a6f1cde4d109baed9054cbb37d9.pdf?index=true
    • http://jekurur.atwebpages.com/25746404782.pdf
    • http://nokejufesuw.atwebpages.com/3557087877.pdf
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_ebb6b56ac912488b9c442a94fb379c00.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b1.bin
45887c8f79be14c087fac4636cb36a8fa47b2c668e3167fe52e721c259d5b876		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5168 bytes
font_01_sfnt_off0000f229.bin
b431b1972101148e8149fa98b0a9848356ea07148888010a15ece12e2790ef4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 12472 bytes
font_02_sfnt_off00011a62.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.